After installing RVM, I have installed Ruby 1.8.7 then Rails 3.
When I do which rails I get /Users/davidbenhamou/.rvm/gems/ruby-1.8.7-p302/bin/rails.
But when I do rails -v I get -bash: /usr/bin/rails: No such file or directory

Why is Rails not working?
Note: I have followed all steps from RVM website and Ruby command line work fine (ruby -v).